diff --git a/Source/NSThread.m b/Source/NSThread.m
index fb90966b9..a5ff4ca8d 100644
--- a/Source/NSThread.m
+++ b/Source/NSThread.m
@@ -567,7 +567,7 @@ unregisterActiveThread(NSThread *thread)
        * if we have become multi-threaded due to a call to the runtime directly
        * rather than via the NSThread class.
        */
-#if defined(__GNUSTEP_RUNTIME__) || defined(__NEXT_RUNTIME__)
+#if defined(__GNUSTEP_RUNTIME__) || defined(NeXT_RUNTIME)
       gnustep_base_thread_callback();
 #else
       objc_set_thread_callback(gnustep_base_thread_callback);